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from $5.00 / 1,000 cfr sections

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US Federal Rules API: CFR text as of a date + Federal Register

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The text of a CFR section as in force today or on any date, its amendment history and the Federal Register rules that changed it; what changed in a CFR part since a date; Federal Register documents by number or search. Official eCFR and FederalRegister.gov data, a source link per row.

Pricing

from $5.00 / 1,000 cfr sections

Rating

0.0

(0)

Developer

Bosco Labs

Actor stats

Bookmarked

Total users

Monthly active users

2 hours ago

Last modified

Categories

Business

Developer tools

Security

schema_version

Optional

Output schema version.

Type:string

record_type

Optional

"cfr_section" (a CFR section or appendix as of a date) or "fr_document" (a Federal Register document).

Type:string

query

Optional

The citation, document number or search as understood, e.g. "21 CFR 101.9".

Type:string | null

citation

Optional

cfr_section: the unit's CFR citation, e.g. "21 CFR 101.9". fr_document: the Federal Register citation (volume FR page), e.g. "91 FR 54658".

Type:string | null

cfr_title

Optional

cfr_section: CFR title number (1-50), e.g. 21.

Type:integer

cfr_title_name

Optional

cfr_section: name of the CFR title, e.g. "Food and Drugs".

Type:string | null

part

Optional

cfr_section: CFR part, e.g. "101".

Type:string | null

subpart

Optional

cfr_section: subpart letter, e.g. "A"; null when the part has none or for appendices.

Type:string | null

section

Optional

cfr_section: section number ("101.9") or appendix name ("Supplement No. 4 to Part 744").

Type:string | null

unit_type

Optional

cfr_section: "section" or "appendix".

Type:string | null

heading

Optional

cfr_section: the heading as printed, e.g. "§ 101.9 Nutrition labeling of food.".

Type:string | null

as_of

Optional

cfr_section: the date (YYYY-MM-DD) the text is in force for: asOf, capped at the eCFR's latest data.

Type:string | null

text

Optional

cfr_section: plain text as in force on as_of, one line per paragraph ("(a) ...", "(1) ..."), tables as "cell | cell" rows; cut at maxTextChars. Null when the unit was removed.

Type:string | null

text_chars

Optional

cfr_section: length of text in characters (after any cut).

Type:integer | null

text_truncated

Optional

cfr_section: true when text was cut at maxTextChars.

Type:boolean | null

source_note

Optional

cfr_section: the CFR source note with the Federal Register citation(s) that created the unit, e.g. "[58 FR 2175, Jan. 6, 1993]".

Type:string | null

removed

Optional

cfr_section: true when the unit was removed from the CFR on or before as_of.

Type:boolean | null

latest_change_date

Optional

cfr_section: date of the newest amendment on or before as_of (YYYY-MM-DD).

Type:string | null

changed_since

Optional

cfr_section from a part citation: the since date of the change window; null for a single-section lookup.

Type:string | null

amendments

Optional

cfr_section: amendment history from the eCFR versioner, newest first (max 50): {date, substantive, removed, fr_documents}. fr_documents lists final rules affecting this CFR part that took effect (or, failing that, were published) on that date: {document_number, citation, title, type, publication_date, effective_on, url}. They are the likely source of the change, matched by part and date (the Federal Register does not index by section). [] = looked up, none found; null = not looked up (only the 5 newest dates, or the dates inside the since window, are).

Type:array

ecfr_up_to_date_as_of

Optional

cfr_section: the date through which the eCFR title is current (YYYY-MM-DD).

Type:string | null

source_url

Optional

eCFR page of the unit as of as_of (cfr_section), or FederalRegister.gov page of the document (fr_document).

Type:string | null

provided_by

Optional

Who compiled this row; cite together with source_url.

Type:string

api_url

Optional

cfr_section: the eCFR versioner API call the text was read from.

Type:string | null

document_number

Optional

fr_document: Federal Register document number, e.g. "2026-17231".

Type:string | null

title

Optional

fr_document: document title.

Type:string | null

type

Optional

fr_document: "Rule", "Proposed Rule", "Notice" or "Presidential Document".

Type:string | null

action

Optional

fr_document: action line, e.g. "Final rule.".

Type:string | null

abstract

Optional

fr_document: the summary published with the document.

Type:string | null

dates

Optional

fr_document: the DATES paragraph as published, e.g. "This rule is effective August 21, 2026.".

Type:string | null

agencies

Optional

fr_document: issuing agencies as FederalRegister.gov names them, e.g. ["Commerce Department", "Industry and Security Bureau"].

Type:array

publication_date

Optional

fr_document: date published in the Federal Register (YYYY-MM-DD).

Type:string | null

effective_on

Optional

fr_document: effective date (YYYY-MM-DD); null when none is given (proposed rules, most notices).

Type:string | null

comments_close_on

Optional

fr_document: comment deadline (YYYY-MM-DD); null when not open for comment.

Type:string | null

cfr_references

Optional

fr_document: CFR parts the document affects, e.g. ["15 CFR 744"].

Type:array

docket_ids

Optional

fr_document: agency docket numbers.

Type:array

regulation_id_numbers

Optional

fr_document: Regulation Identifier Numbers (RIN), e.g. ["0694-AK49"].

Type:array

start_page

Optional

fr_document: first Federal Register page.

Type:integer | null

end_page

Optional

fr_document: last Federal Register page.

Type:integer | null

significant

Optional

fr_document: whether the rule is marked significant under EO 12866; null when not stated.

Type:boolean | null

pdf_url

Optional

fr_document: the official PDF on govinfo.gov (the legally authentic edition).

Type:string | null

raw_text_url

Optional

fr_document: full text as plain text on FederalRegister.gov.

Type:string | null

warnings

Optional

Caveats in plain words: text cut, date capped, more results than returned, part-level matching.

Type:array

retrieved_at

Optional

When the row was made (ISO 8601, UTC).

Type:string

duration_seconds

Optional

How long the lookup took.

Type:number

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